Growth of ______________ is promoted by the presence of manganese in water?

A. Idle running
B. Acceleration
C. Cruising
D. Deceleration

A. Filtration
B. Digestion
C. Sedimentation
D. Both B. and C.

A. Using the activities of bacteria and other micro organisms
B. Aerobic oxidation
C. Both A. & B.
D. Neither A. nor B.

A. Ferrous sulphate
B. Alum
C. Lime
D. Hydrazine

A. Filtration
B. Coagulation
C. Sedimentation
D. Disinfection

A. Chlorine
B. Irradiation of water by ultraviolet light
C. Cation exchanger
D. Coagulation